Abstract: A vacuum pump for a desoldering iron gun which comprises a cylinder closed at one end with a piston movable in the cylinder, and device including a valve connecting the closed end of the cylinder to the gun. A spring normally urges the piston away from the closed end of the cylinder, and drive linkage connects the piston to a motor for moving the piston toward the closed end of the cylinder against the urging of the spring. Latch device holds the piston in position adjacent the closed end of the cylinder. Trip device for releasing the latch is operated by the same motor. Operation is initiated by a switch on the gun that starts the motor, causing the trip mechanism to release the latch, and the spring to force the piston away from the closed end to produce a partial vacuum. The motor continues to run through its cycle, again compressing the spring and moving the piston back to its latched position.

Abstract: A valve actuator, usable in pump-type and aerosol fluid product dispensers, includes a one-piece part mounted on the plunger or valve stem of the dispenser for axial reciprocating movement therewith and for rotation relative thereto. The upper end of the plunger or stem has a cylindrical segment covering a cavity surrounding the discharge orifice and a tangentially extending groove so as to form, in a first relative position of the actuator, a swirl chamber and a fluid passage which is open beyond the periphery of the segment so as to establish communication between the outlet of the plunger and the orifice via the fluid passage to thereby effect a fluid spray from the swirl chamber upon plunger reciprocation. In a second relative position of the actuator, the segment uncovers the groove and cavity so as to establish direct communication between the plunger outlet and the discharge orifice so that the fluid is discharged as a solid fluid through the orifice upon plunger reciprocation.